Why '365'? One page for every day of the year? Something about it suggests it's a calendar book.

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Apparently that's the conceit of the series, which is also called the "365 Days" series. They're not calendars, but heavy coffee-table books (Star Trek 365 weighs nearly four and a half pounds), and some of them have dates instead of page numbers and are divided into chapters by "month." Apparently, as far as I can tell, the idea is that you can read one pair of pages per day and literally learn something new every day about the book's subject. I don't know why they follow that conceit, though. Maybe someone just liked the idea of fact-a-day calendars and decided to concoct a classier, more expensive version.

With the exception of "high profile" books (Harry Potter, King; etc.) books usually don't have set release dates on which they are allowed to be sold. The book sellers can sell them when they get them, which usually is some time before the "release date".